SB2024011070 - Improper neutralization of equivalent special elements in Juniper Junos OS

Security Bulletin ID SB2024011070

CSH Severity

Medium

Patch available

YES

Number of vulnerabilities 1

Exploitation vector Adjecent network

Highest impact Denial of service

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 1 vulnerability.

1) Improper neutralization of equivalent special elements (CVE-ID: CVE-2024-21600)

CWE-ID: CWE-76 - Improper Neutralization of Equivalent Special Elements

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper neutralization of equivalent special elements error in the Packet Forwarding Engine (PFE). A remote non-authenticated attacker can cause a Denial of Service (DoS).

When MPLS packets are meant to be sent to a flexible tunnel interface (FTI) and if the FTI tunnel is down, these will hit the reject NH, due to which the packets get sent to the CPU and cause a host path wedge condition.

This will cause the FPC to hang and requires a manual restart to recover.

Remediation

Install update from vendor's website.

References

https://supportportal.juniper.net/s/article/2024-01-Security-Bulletin-Junos-OS-PTX-Series-In-an-FTI-scenario-MPLS-packets-hitting-reject-next-hop-will-cause-a-host-path-wedge-condition-CVE-2024-21600